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#include "linear_layout.hpp"
#include <algorithm>
#include "math_util.hpp"
namespace cru::ui::controls
{
LinearLayout::LinearLayout(const Orientation orientation)
: orientation_(orientation)
{
}
StringView LinearLayout::GetControlType() const
{
return control_type;
}
Size LinearLayout::OnMeasureContent(const Size& available_size, const AdditionalMeasureInfo& additional_info)
{
auto actual_size_for_children = Size::Zero();
float secondary_side_child_max_length = 0;
std::list<Control*> stretch_control_list;
// First measure Content and Exactly and count Stretch.
if (orientation_ == Orientation::Horizontal)
for(auto control: GetInternalChildren())
{
const auto mode = control->GetLayoutParams()->width.mode;
if (mode == MeasureMode::Content || mode == MeasureMode::Exactly)
{
Size current_available_size(AtLeast0(available_size.width - actual_size_for_children.width), available_size.height);
control->Measure(current_available_size, additional_info);
const auto size = control->GetDesiredSize();
actual_size_for_children.width += size.width;
secondary_side_child_max_length = std::max(size.height, secondary_side_child_max_length);
}
else
stretch_control_list.push_back(control);
}
else
for(auto control: GetInternalChildren())
{
const auto mode = control->GetLayoutParams()->height.mode;
if (mode == MeasureMode::Content || mode == MeasureMode::Exactly)
{
Size current_available_size(available_size.width, AtLeast0(available_size.height - actual_size_for_children.height));
control->Measure(current_available_size, additional_info);
const auto size = control->GetDesiredSize();
actual_size_for_children.height += size.height;
secondary_side_child_max_length = std::max(size.width, secondary_side_child_max_length);
}
else
stretch_control_list.push_back(control);
}
if (orientation_ == Orientation::Horizontal)
{
const auto available_width = AtLeast0(available_size.width - actual_size_for_children.width) / stretch_control_list.size();
for (const auto control : stretch_control_list)
{
control->Measure(Size(available_width, available_size.height), additional_info);
const auto size = control->GetDesiredSize();
actual_size_for_children.width += size.width;
secondary_side_child_max_length = std::max(size.height, secondary_side_child_max_length);
}
}
else
{
const auto available_height = AtLeast0(available_size.height - actual_size_for_children.height) / stretch_control_list.size();
for (const auto control : stretch_control_list)
{
control->Measure(Size(available_size.width, available_height), additional_info);
const auto size = control->GetDesiredSize();
actual_size_for_children.height += size.height;
secondary_side_child_max_length = std::max(size.width, secondary_side_child_max_length);
}
}
if (orientation_ == Orientation::Horizontal)
{
for (auto control : GetInternalChildren())
{
if (control->GetLayoutParams()->height.mode == MeasureMode::Stretch)
{
control->SetDesiredSize(Size(control->GetDesiredSize().width, secondary_side_child_max_length));
}
}
actual_size_for_children.height = secondary_side_child_max_length;
}
else
{
for (auto control : GetInternalChildren())
{
if (control->GetLayoutParams()->width.mode == MeasureMode::Stretch)
{
control->SetDesiredSize(Size(secondary_side_child_max_length, control->GetDesiredSize().height));
}
}
actual_size_for_children.width = secondary_side_child_max_length;
}
return actual_size_for_children;
}
void LinearLayout::OnLayoutContent(const Rect& rect, const AdditionalLayoutInfo& additional_info)
{
float current_main_side_anchor = 0;
for(auto control: GetInternalChildren())
{
const auto layout_params = control->GetLayoutParams();
const auto size = control->GetDesiredSize();
const auto alignment = orientation_ == Orientation::Horizontal ? layout_params->height.alignment : layout_params->width.alignment;
auto&& calculate_secondary_side_anchor = [alignment](const float layout_length, const float control_length) -> float
{
switch (alignment)
{
case Alignment::Center:
return (layout_length - control_length) / 2;
case Alignment::Start:
return 0;
case Alignment::End:
return layout_length - control_length;
default:
UnreachableCode();
}
};
auto&& calculate_rect = [rect, size](const float anchor_left, const float anchor_top)
{
return Rect(Point(rect.left + anchor_left, rect.top + anchor_top), size);
};
if (orientation_ == Orientation::Horizontal)
{
control->Layout(calculate_rect(current_main_side_anchor, calculate_secondary_side_anchor(rect.height, size.height)), additional_info);
current_main_side_anchor += size.width;
}
else
{
control->Layout(calculate_rect(calculate_secondary_side_anchor(rect.width, size.width), current_main_side_anchor), additional_info);
current_main_side_anchor += size.height;
}
}
}
}
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